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Corrosion-resistant high-strength welding material for E690 steel for ocean engineering

A welding material and marine engineering technology, applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., to achieve the effect of improving weld stability, wide application prospects, and improving mechanical properties

Active Publication Date: 2021-04-23
哈焊所华通(常州)焊业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a corrosion-resistant high-strength E690 steel welding material used in ocean engineering, to solve the corrosion resistance, crack resistance, hydrogen diffusion, and fracture toughness of deposited metal of the existing E690 steel welding material , Deposited metal strength and other comprehensive indicators cannot meet the technical problems of existing development needs

Method used

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  • Corrosion-resistant high-strength welding material for E690 steel for ocean engineering
  • Corrosion-resistant high-strength welding material for E690 steel for ocean engineering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0018] The welding wire (diameter is 1.2mm) of the composition of embodiment 1-3 is prepared by the conventional process of the prior art, and the welding wire composition is as table 1:

[0019] Table 1 Embodiment 1~3 welding wire chemical composition (wt / %)

[0020] C Si mn P S Cr Ni Mo O N ≤0.09 0.40-0.70 1.25-1.80 ≤0.010 ≤0.005％ ≤0.40 0.75-1.00 0.20-0.5 ≤0.005％ ≤0.010％ Example 1 0.07 0.62 1.68 0.006 0.004 0.40 0.95 0.39 0.0008 0.006 Example 2 0.07 0.57 1.71 0.007 0.003 0.39 0.91 0.42 0.0003 0.005 Example 3 0.07 0.59 1.68 0.006 0.004 0.38 0.97 0.46 0.0004 0.005

[0021] Using 20% ​​CO 2 +80%Ar Deposited metal test was carried out on E690 steel plate with a sample thickness of 20mm.

[0022] The steel plate specimen preparation and welding specifications refer to the GB / T 8110 standard. And the size of the welding material and the surface quality of the welding wire shall comply with the...

Embodiment 1～3

[0024] Table 2 Chemical composition of deposited metal in Examples 1-3

[0025] C Si mn P S Cr Ni Mo O N Example 1 0.07 0.54 1.54 0.008 0.005 0.35 0.85 0.35 0.001 0.008 Example 2 0.07 0.52 1.56 0.009 0.004 0.34 0.88 0.37 0.0009 0.007 Example 3 0.07 0.51 1.53 0.008 0.005 0.33 0.87 0.40 0.0006 0.007 Project requirements ≤0.10 ≤0.60 ≤1.80 ≤0.010 ≤0.005 ≤0.40 ≤1.00 ≤0.65 ≤0.005 ≤0.010

[0026] The samples of Examples 1 to 3 were tested for properties such as weld tension, and the test results are shown in Table 3:

[0027] Table 3 The mechanical properties of the deposited metal in Examples 1 to 3

[0028]

[0029]

[0030] Table 4 shows the performance testing of the hydrogen content of the deposited metal and the fracture toughness of the deposited metal

[0031] Deposit metal diffusible hydrogen content Deposited metal fracture toughness (CTOD), test temperature -10°C ...

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Abstract

The invention provides a corrosion-resistant high-strength welding material for E690 steel for ocean engineering. A gas shielded welding wire matched with an E690 steel material is selected and welded under specific protective gas, and the gas shielded welding wire comprises the following chemical components in percentage by mass of less than or equal to 0.09% of C, 0.40-0.70% of Si, 1.25-1.80% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, less than or equal to 0.40% of Cr, 0.75-1.00% of Ni, 0.20-0.55% of Mo, less than or equal to 0.005% of O and less than or equal to 0.010% of N. The gas shielded welding wire is used for welding the E690 steel, and mixed gas of 80% Ar and 20% CO2 is adopted as protective gas during welding. After welding, the technical problem that comprehensive indexes such as corrosion resistance, crack resistance, diffusible hydrogen, deposited metal fracture toughness and deposited metal strength of an existing welding material for E690 steel cannot meet existing development requirements is solved.

Description

technical field [0001] The invention relates to a welding material, in particular to a corrosion-resistant and high-strength E690 steel welding material used in ocean engineering. Background technique [0002] Among the iron and steel enterprises in my country, E690 steel for offshore platforms has been developed very early, and the share of the extra-thick plates over 50mm in the domestic market has always been more than 30%. Steel plate strength, impact toughness, weather resistance and seawater corrosion resistance have also met the requirements of marine engineering. The service environment of marine steel structures is complex and harsh. For high-strength steel for offshore platforms, due to its special workplace, harsh working environment, long service period, and long-term service in complex and harsh environments such as seawater, ocean atmosphere, and alternating wet and dry conditions. In a highly corrosive environment; in addition to bearing its own gravity load,...

Claims

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Application Information

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IPC IPC(8): B23K35/30
CPCB23K35/3073Y02P10/20
Inventor 李振华居晓锋居程亮宣文华
Owner 哈焊所华通(常州)焊业股份有限公司